test: add type alias test that caused gccgo to crash
test: add type alias test that caused gccgo to crash

Change-Id: I3b388e4ac05ace5b7768ade03df2bee5bcc26ba8
Reviewed-on: https://go-review.googlesource.com/73790
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>

CAFxX/go,cloudflare/go,codestation/go,CAFxX/go,Cofyc/go,golang/go,josharian/go,Cofyc/go,cloudflare/go,akutz/go,codestation/go,golang/go,cloudflare/go,golang/go,Cofyc/go,golang/go,Cofyc/go,cloudflare/go,nawawi/go,CAFxX/go,akutz/go,akutz/go,codestation/go,codestation/go,josharian/go,golang/go,codestation/go,akutz/go,Cofyc/go,CAFxX/go,golang/go,josharian/go,Cofyc/go,nawawi/go,josharian/go,josharian/go,Cofyc/go,josharian/go,christopher-henderson/Go,cloudflare/go,golang/go,cloudflare/go,josharian/go,cloudflare/go,nawawi/go,nawawi/go,golang/go,codestation/go,CAFxX/go,nawawi/go,CAFxX/go,josharian/go,akutz/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,CAFxX/go,codestation/go,CAFxX/go,akutz/go,nawawi/go,Cofyc/go,codestation/go,akutz/go